harmóníum

Etymology
Borrowed from, from , a pseudo-Latin trade name coined from.

Noun

 * 1) reed organ

Declension
The word may be declined according to the regular paradigm for strong neuter nouns:

However, the dative and genitive plural forms are awkward in pronunciation, and seem to be generally avoided; those forms are not attested.

A dative singular harmóníum (or harmoníum) is attested, and also other variations, such as a Latinate plural harmónía, and forms that drop the -um upon the addition of native inflectional endings or the appended article (as is the norm in Danish): harmóníið, harmóníi, harmóníinu.